I have spent a few hours reviewing at XDA posts about updating to newer 4.4.2 (or other) and it seems like a very problem laden process - too many reports of excessive battery drain, lock screen, voicemail, wi-fi, etc issue's that I simply don't have on my current build. Currently with the Samsung app's I don't need frozen via Titanium, a custom launcher, Llama, and a few other changes I have a very stable, very fast, very reliable phone with the exception of not being able to implement a firewall (which I would really like for a couple of app's who talk too much!), evidently due to a kernel issue.
Question is - can I update the kernel to one without this IP table/re-boot issue without loosing stability, root, my current app's/data? I'm happy staying with 4.2.2 MF9 - no bootloader issue's introduced in 4.3 and beyond etc. - so that is my level of satisfaction with my current set-up. It also obviously reflects my level of competence and unwillingness to potentially screw up my phone - especially a boot loop type issue - which I encountered 1 time out of 7 devices I had otherwise successfully rooted over the last 2 years. My wife's S4 is at exactly the same level and has the identical issue BTW - mentioned since in my search I didn't seem to find this IP table issue discussed?